pondscum
nounUK /ˈpɒnd.skʌm/
US /ˈpɑːnd.skʌm/
Green slime that floats on top of pond water.
The children scooped up some pondscum with a net to look at it closely.
SYNONYMS
OTHER MEANINGS
2. A person who is considered worthless or unpleasant.
He treated everyone badly, so people called him pondscum.
3. Any low, worthless, or contemptible group of people.
The crooks were the pondscum of the neighborhood.
4. A thin layer of dirt or waste floating on still water.
A film of pondscum covered the surface after the hot summer.